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"""
# TOP2049 Open Source programming suite
#
# TOP2049 Shiftregister based layout definitions
#
# Copyright (c) 2010 Michael Buesch <mb@bu3sch.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
class ShiftregLayout:
def __init__(self, nrShiftRegs):
assert(nrShiftRegs <= 4)
self.nrShiftRegs = nrShiftRegs
self.layouts = []
for id in range(0, len(self.shiftreg_masks)):
shreg_mask = self.shiftreg_masks[id]
zif_mask = 0
for bit in range(0, self.nrShiftRegs * 8):
if (shreg_mask & (1 << bit)) == 0:
continue
regId = self.__bitnr2shregId(bit)
zifPin = self.shreg2zif_map[regId]
zif_mask |= (1 << (zifPin - 1))
if id == 0 or zif_mask != 0:
self.layouts.append( (id, zif_mask) )
def __bitnr2shregId(self, bitNr):
if bitNr >= 24:
register = 3
pin = bitNr - 24
elif bitNr >= 16:
register = 2
pin = bitNr - 16
elif bitNr >= 8:
register = 1
pin = bitNr - 8
else:
register = 0
pin = bitNr
return "%d.%d" % (register, pin)
def __repr__(self):
res = ""
for (id, zif_mask) in self.supportedLayouts():
res += "Layout %d:\n" % id
res += " o---------o\n"
for pin in range(1, 25):
left = " "
right = ""
if (1 << (pin - 1)) & zif_mask:
left = "HOT >"
if (1 << (49 - pin - 1)) & zif_mask:
right = "< HOT"
res += "%s | %2d | %2d | %s\n" % (left, pin, 49 - pin, right)
res += " o---------o\n\n"
return res
def supportedLayouts(self):
"""Returns a list of supported layouts.
Each entry is a tuple of (id, bitmask), where bitmask is
the ZIF layout. bit0 is ZIF-pin-1. A bit set means a hot pin."""
return self.layouts
def setLayoutPins(self, zifPinsList):
"""Load a layout. zifPinsList is a list of hot ZIF pins.
The first ZIF pin is 1."""
zifMask = 0
for zifPin in zifPinsList:
assert(zifPin >= 1)
zifMask |= (1 << (zifPin - 1))
return self.setLayoutMask(zifMask)
def setLayoutMask(self, zifMask):
"Load a ZIF mask."
for (layoutId, layoutMask) in self.layouts:
if layoutMask == zifMask:
self.setLayoutID(layoutId)
return True
raise Exception()
#return False
def setLayoutID(self, id):
"Load a specific layout ID."
# Reimplement me in the subclass
raise Exception()
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